UNIVERSITI TEKNIKAL MALAYSIA MELAKA

DOMESTIC LPG LEAKAGE DETECTION SYSTEM USING

MICROCONTROLLER AND GSM NETWORK

This report submitted in accordance with requirement of the Universiti Teknikal

Malaysia Melaka (UTeM) for the Bachelor Degree of Electrical Engineering

Technology

(Industrial Automation and Robotics) (Hons.)

by

SITI NURHASHIMA BINTI ISMAIL

B071210277

930527-01-6510

FACULTY OF ENGINEERING TECHNOLOGY 2015

UNIVERSITI TEKNIKAL MALAYSIA MELAKA

BORANG PENGESAHAN STATUS LAPORAN PROJEK SARJANA MUDA

TAJUK: Domestic LPG Leakage Detection System Using Microcontroller and

GSM Network

SESI PENGAJIAN: 2015/16 Semester 2

Saya SITI NURHASHIMA BINTI ISMAIL

mengaku membenarkan Laporan PSM ini disimpan di Perpustakaan Universiti

Teknikal Malaysia Melaka (UTeM) dengan syarat-syarat kegunaan seperti berikut:

1. Laporan PSM adalah hak milik Universiti Teknikal Malaysia Melaka dan penulis. 2. Perpustakaan Universiti Teknikal Malaysia Melaka dibenarkan membuat salinan

untuk tujuan pengajian sahaja dengan izin penulis. 3. Perpustakaan dibenarkan membuat salinan laporan PSM ini sebagai bahan

pertukaran antara institusi pengajian tinggi.

4. **Sila tandakan ( )

SULIT

TERHAD

TIDAK TERHAD

(Mengandungi maklumat yang berdarjah keselamatan

atau kepentingan Malaysia sebagaimana yang termaktub

dalam AKTA RAHSIA RASMI 1972)

(Mengandungi maklumat TERHAD yang telah ditentukan

oleh organisasi/badan di mana penyelidikan dijalankan)

(TANDATANGAN PENULIS)

Alamat Tetap:

No. 247-1, Kampung Ubi,

Jalan Daud 84000,

Muar, Johor.

Tarikh: ________________________

Disahkan oleh:

(TANDATANGAN PENYELIA)

Cop Rasmi:

Tarikh: _______________________

** Jika Laporan PSM ini SULIT atau TERHAD, sila lampirkan surat daripada pihak berkuasa/organisasi

berkenaan dengan menyatakan sekali sebab dan tempoh laporan PSM ini perlu dikelaskan sebagai

SULIT atau TERHAD.

FAKULTI TEKNOLOGI KEJURUTERAAN Tel : +606 234 6623 | Faks : +606 23406526

Rujukan Kami (Our Ref) : Rujukan Tuan (Your Ref) :

12 DEC 2015 Pustakawan Perpustakaan UTeM Universiti Teknikal Malaysia Melaka Hang Tuah Jaya, 76100 Durian Tunggal, Melaka. Tuan/Puan, PENGKELASAN LAPORAN PSM SEBAGAI SULIT/TERHAD LAPORAN PROJEK SARJANA MUDA TEKNOLOGI KEJURUTERAAN ELEKTRIK (AUTOMASI INDUSTRI DAN ROBOTIK): SITI NURHASHIMA BINTI ISMAIL Sukacita dimaklumkan bahawa Laporan PSM yang tersebut di atas bertajuk “Domestic LPG Leakage Detection System Using Microcontroller and GSM Network” mohon dikelaskan sebagai *SULIT / TERHAD untuk tempoh LIMA (5) tahun dari tarikh surat ini. 2. Hal ini adalah kerana IANYA MERUPAKAN PROJEK YANG DITAJA OLEH SYARIKAT LUAR DAN HASIL KAJIANNYA ADALAH SULIT. Sekian dimaklumkan. Terima kasih. Yang benar, ________________ Tandatangan dan Cop Penyelia * Potong yang tidak berkenaan

NOTA: BORANG INI HANYA DIISI JIKA DIKLASIFIKASIKAN SEBAGAI SULIT DAN TERHAD. JIKA LAPORAN DIKELASKAN SEBAGAI TIDAK TERHAD, MAKA BORANG INI TIDAK PERLU DISERTAKAN DALAM LAPORAN PSM.

iv

DECLARATION

I hereby, declared this report entitled “Domestic LPG Leakage Detection System

Using Microcontroller and GSM Network” is the results of my own research except

as cited in references.

Signature :………………………

Name : ………………………

Date : ………………………

SITI NURHASHIMA BINTI ISMAIL

v

APPROVAL

This report is submitted to the Faculty of Engineering Technology of UTeM as a

partial fulfillment of the requirements for the degree of Bachelor of Electrical

Engineering Technology (Industrial Automation and Robotics) (Hons.). The

member of the supervisory is as follow:

……………………………….

(Project Supervisor)

vi

ABSTRACT

LPG is an abbreviation from Liquefied Petroleum Gases that consist of substances such as propane and butane. It is highly flammable and can easily burn even at some distance from the source of leakage. LPG leakage is a major problem in residential area and may cause fatal inferno if the leakage is not prevented. One of the preventive measures to avoid the danger associated with gas leakage is to install a LPG leakage detector at vulnerable places. This project focuses on issues such as for the people who have a low sense of smell that may not be able to recognize upon this inherent safety mechanism and to alert people on the danger of gas leakage in their home and premises. The aim of this project is to design and build a system of a microcontroller-based prototype of domestic LPG leakage detection and to develop an automatic alert system by using GSM network with LPG supply cut-off valve with the aid of servo motor. The cutting-off of the LPG valve is to stop the gas from continuously flowing to surrounding. Besides, this system prototype is developed as a mechanism to provide community service in the form of educational kit for academic institutions, especially for schools and pre-university students to promote safety awareness and knowledge in engineering technology. When the system detects the LPG concentration in the air has reach certain levels of pre-determined settings, then it will immediately alerts users by sending signals to GSM network using SMS. As results, a servo motor is activated to safely cut-off the gas regulator knob or disable the LPG supply. This system is capable to minimize injuries or property loss associated by explosion due to gas leakage while using domestic cooking gas.

vii

ABSTRAK

LPG ialah satu singkatan dari Liquefied Petroleum Gases yang terdiri daripada bahan seperti propana dan butana. Ia sangat mudah terbakar dan boleh dengan mudah membakar walaupun di beberapa jarak dari sumber kebocoran. Kebocoran LPG ialah satu masalah utama di kawasan kediaman dan boleh menyebabkan kebakaran membawa maut jika kebocoran tidak dicegah. Salah satu langkah pencegahan untuk mengelak bahaya berkaitan dengan kebocoran gas adalah dengan memasang alat pengesan bocor LPG di tempat-tempat mudah terjejas. Penekanan utama dalam projek ini ialah untuk membantu mereka yang mempunyai deria hidu rendah yang mungkin tidak dapat mengecam mekanisme keselamatan sedia ada ini dan untuk mendedahkan kepada umum akan bahayanya kebocoran LPG di premis mereka. Tujuan projek ini adalah untuk mereka dan membina satu sistem prototaip berasaskan mikropengawal pengesanan kebocoran LPG tempatan dan membangunkan satu sistem amaran automatik dengan menggunakan rangkaian GSM dengan injap penyekat bekalan LPG dengan bantuan motor pelangkah. Injap LPG disekat adalah untuk menghentikan aliran gas ke sekeliling. Selain itu, sistem ini direka untuk memberi perkhidmatan kepada komuniti berbentuk kelengkapan pendidikan kepada pelajar di seluruh institusi. Apabila sistem ini mengesan tahap kelikatan LPG di udara melebihi tahap tertentu maka mikropengawal akan menghantar isyarat kepada GSM untuk menghantar khidmat pesanan ringkas (SMS) kepada pengguna. Kemudian, motor pelangkah diaktifkan untuk menyekat LPG dengan selamat. Sistem ini dapat menghindarkan sebarang kecederaan atau kehilangan harta benda disebabkan oleh letupan kebocoran gas dan meningkatkan keselamatan diri semasa menggunakan gas memasak di rumah atau premis-premis kecil.

viii

DEDICATIONS

To my beloved parents

To my supervisor, Mr. Maslan Bin Zainon

To my lecturers

And not forgetting to all dear friends

Especially Nurul Atikah Azis

For their love, support, sacrifice, encouragement and motivation.

ix

ACKNOWLEDGMENTS

Assalamualaikum Warahmatullahi Wabarakatuh.

First and foremost, thank you to Allah S.W.T who give me strength, patience and

courage as well as the knowledge to enable me successfully complete this project.

Peace and blessings be upon Muhammad S.A.W, the true Messenger of Allah for his

bountiful bond of lovers to his ummah.

I would like to take this golden opportunity to express my heartiest gratitude and

thankfulness to my supervisor, Mr. Maslan Bin Zainon, for his constant guidance,

valuable assistance and support as well as his patience in helping me to complete this

work successfully. In many instances, it was tough for me but he was there to assist.

Thank you.

My deepest thanks to all lecturers who have thought me, direct or indirectly, for all

these four years of studies. I will never forget all the precious knowledge learnt and

gained Inshaa Allah.

I am indebted to all my fellow colleagues for their help and support to finish this

project. In particular, I am deeply very grateful to Nurul Atikah binti Azis for helping

me in the sequence of report during finishing my report writing and designing this

project. I thank them all for their utmost moral support, love and care in all aspect.

Thank you.

x

TABLE OF CONTENTS

DECLARATION ................................................................................................................. iv

APPROVAL ........................................................................................................................... v

ABSTRACT ......................................................................................................................... vi

ABSTRAK .......................................................................................................................... vii

DEDICATIONS ................................................................................................................. viii

ACKNOWLEDGMENTS ................................................................................................... ix

TABLE OF CONTENTS ....................................................................................................... x

LIST OF TABLES ............................................................................................................... xv

LIST OF SYMBOLS AND ABBREVIATIONS .............................................................. xvi

CHAPTER 1 .......................................................................................................................... 1

1.0 Introduction ............................................................................................................. 1

1.1 Background ............................................................................................................. 1

1.2 Problem Statement .................................................................................................. 2

1.3 Objectives ................................................................................................................ 2

1.4 Scope of Project ....................................................................................................... 3

1.5 Conclusion ............................................................................................................... 3

CHAPTER 2 .......................................................................................................................... 4

2.0 Introduction ............................................................................................................. 4

2.1 PIC16F877A as A Controller .................................................................................. 4

Introduction ...................................................................................................... 5

xi

Previous Research ............................................................................................ 6

2.2 GSM Modem Network ............................................................................................ 7

Introduction ...................................................................................................... 7

Previous Research ............................................................................................ 8

2.3 MQ-6 Sensor ......................................................................................................... 10

Introduction .................................................................................................... 10

Previous Research .......................................................................................... 10

2.4 Servo Motor ........................................................................................................... 11

Introduction .................................................................................................... 12

Previous Research .......................................................................................... 12

CHAPTER 3 ........................................................................................................................ 14

3.0 Introduction ........................................................................................................... 14

3.1 Work Flow ............................................................................................................. 15

3.2 System Structure .................................................................................................... 16

3.3 Software Development .......................................................................................... 18

3.4 MikroC for PIC16F877A ...................................................................................... 19

3.5 Electrical Hardware Review .................................................................................. 20

PIC16F877A Microcontroller ........................................................................ 20

3.5.1.1 High Performance RISC CPU ................................................................ 21

3.5.1.2 Peripheral Features ................................................................................. 22

3.5.1.3 Analog Features ...................................................................................... 22

3.5.1.4 Analog to Digital Converter (ADC) ....................................................... 22

GSM Module .................................................................................................. 23

xii

3.5.2.1 AT Command ......................................................................................... 24

3.5.2.2 Connection Between PIC16F877A and SIMCOM900A ........................ 25

3.5.2.3 MQ-6 Gas Sensor.................................................................................... 25

3.5.2.4 Power Supply Unit (PSU) ....................................................................... 26

3.6 Mechanical Hardware Review .............................................................................. 26

Futaba S3003 Servo Motor ............................................................................ 26

3.7 System Operation .................................................................................................. 27

CHAPTER 4 ........................................................................................................................ 29

4.0 Introduction ........................................................................................................... 29

4.1 Testing the Hardware ............................................................................................ 29

4.2 Discussion ............................................................................................................. 30

CHAPTER 5 ........................................................................................................................ 35

5.0 Introduction ........................................................................................................... 35

5.1 Summary of Research ........................................................................................... 35

5.2 Achievement of Project Objectives ....................................................................... 36

5.3 Significance of Project .......................................................................................... 36

5.4 Problems Faced During Project Development ...................................................... 36

5.5 Suggestion for Future Work .................................................................................. 37

APPENDIX A ...................................................................................................................... 39

APPENDIX B ...................................................................................................................... 45

APPENDIX C1 .................................................................................................................... 47

APPENDIX C2 .................................................................................................................... 52

APPENDIX C3 .................................................................................................................... 59

xiii

REFERENCES ..................................................................................................................... 65

xiv

LIST OF FIGURES

Figure 2.1: PIC 16F877A pins ..................................................................................... 4

Figure 2.2: Arduino Duemilanove with ATmega328p microcontroller ...................... 6

Figure 2.3: SIMCOM300 GSM Modem, T.Soundarya et al. (2014) ........................... 8

Figure 2.4: MQ-6 sensor ............................................................................................ 10

Figure 2.5: Servo motor ............................................................................................. 12

Figure 2.6: DC motor with electromagnet as stator, T. Soundarya et al. (2014) ....... 13

Figure 3.1: Flowchart of overall project .................................................................... 15

Figure 3.2: System block diagram of the project ....................................................... 17

Figure 3.3: Flowchart of software development ........................................................ 19

Figure 3.4: PIC functional diagram ............................................................................ 21

Figure 3.5: Connection between PIC and GSM module ............................................ 25

Figure 3.6: Typical sensitivity characteristics of MQ-6 gas sensor for several gases 26

Figure 3.7: Futaba S3003 servo motor ....................................................................... 27

Figure 3.8: Flowchart of the system operation .......................................................... 28

Figure 4.1: Hardware of the project ........................................................................... 30

Figure 4.2: Prototype of the project ........................................................................... 30

Figure 4.3: Chart of measured parameter ................................................................... 32

Figure 4.4: Gas regulator knob at ON condition before the gas leakage occur ......... 34

Figure 4.5: Gas regulator knob at OFF condition after the gas leakage occur at above 2.0V ............................................................................................................................ 34

xv

LIST OF TABLES

Table 3.1: Butane gas concentration and voltage levels according to UK safety standards, Mahalingam et al. (n.d) . ........................................................................... 18

Table 4.1: Table of parameter measured during test condition .................................. 32

Table 4.2: Summary of test condition and results ...................................................... 33

xvi

LIST OF SYMBOLS AND ABBREVIATIONS

LPG = Liquefied Petroleum Gases

GSM = Global System for Mobile Communication

PIC = Programmable Integrated Circuit

PC = Personal Computer

AT = ATTENTION command

CMOS = Complementary Metal-Oxide Semiconductor

RISC = Reduced Instruction Set Computer

EEPROM = Electrically Erasable Programmable Read-Only Memory

PWM = Pulse Width Modulation

UART = Universal Asynchronous Receiver/Transmitter

ADC = Analog-Digital Converter

PCMCIA = Personal Computer Memory Card International Association

USB = Universal Serial Bus

GPRS = General Packet Radio Service

DCS = Distributed Control System

TCP/IP = Transmission Control Protocol/Internet Protocol

SMS = Short Message Service

TPDU = Transport Protocol Data Unit

MMS = Multimedia Messaging Service

DC = Direct Current

GPS = Global Positioning System

1

CHAPTER 1 INTRODUCTION

1.0 Introduction

This chapter explain the background of this project, problem statements,

objectives and conclusion for this chapter as well as the limitations in completing this

research. The structure of the report of the project is briefly explained to ensure a

better visualization of the sequence of the entire project.

1.1 Background

LPG or LP Gas is the truncation of Liquefied Petroleum Gas. This gathering of

items incorporates saturated hydrocarbons – propane (C3H8) and butane (C4H10),

which can be put away and transported independently or as a mixture. They exist as

gasses at typical room temperature and air weight. LPG was initially delivered by Dr.

Walter Snelling in 1910. Those hydrocarbons are profoundly combustible and

hazardous. If the liquefied petroleum gas leak is a gas leak it may not be seen

because LPG is colourless, except where the leak is of sufficient size to be seen

shimmering in the air.

At the point when a fluid LPG break happens, the gas discharge will be as a

patch of ice around the zone of the release, or as a plane of white fluid. This white

appearance is because of the cooling impact made by the quick development the LPG

fluid into a gas. The gathering air dampness makes them noticeable. In gathered

sums and in uncontrolled conditions, LPG can possibly make a flame or a blast. LPG

leakage is a major concern with private and business premises in view of its alluring

properties which incorporate high calorific quality, which create the less smoke,

creates less residue, and does not bring about much damage to nature. LPG is

additionally utilized as other fuel as a part of vehicles because of taking off in the

costs of petrol and diesel. The gasses being heavier than air do not scatter effectively

2

and may prompt suffocation when breathed in. The spilled gasses when lighted may

lead to explosion.

1.2 Problem Statement

LPG consists of mixture of propane and butane which is highly flammable

chemical. Since the LPG as such does not have any odour, gas companies or

refineries add an odorant such as Ethanethoil, Thiophene or a Mercaptan so that

leaks can be detected easily by most people. However, some people who have a low

sense of smell may or may not be able to rely upon this inherent safety mechanism.

In such cases, a gas leakage detector becomes vital and helps to protect people from

the dangers of gas leakage. When the leakage is exposed to atmospheric air with high

level concentration of LPG, it may cause explosion. Due to this explosion, there will

be a number of death. In order to avoid explosion, gas leakage detector become an

essential and help to protect from gas leakage accidents. This project will focused on

LPG leakage detector by using PIC16F877A microcontroller and SIMCOM900A

GSM network also the using servo motor to cut off the gas supply for safety

prevention.

1.3 Objectives

The main objectives of this project are:

(a) to design and build a microcontroller-based prototype of domestic LPG

leakage detection system,

(b) to develop an automatic alert system with LPG supply cut-off using GSM

network and servo motor, and

(c) to develop the prototype as an educational training tool to promote

knowledge in engineering technology to community.

3

1.4 Scope of Project

In order to obtain a clearer visualization and achieve the objectives of this

project, the scope of the project has been performed. In general, the goal of this

project is to design a prototype on LPG leakage detection controlled by PIC16F877A

using MQ-6 gas sensor. Then, SIM900A GSM module will be used as fast-response

notification that will alert the users about the leakage. In order to prevent the

explosion, servo motor drive will be activated to cut off the gas valve at the regulator

gas knob. All these hardware are selected based on their characterization and the

ability to give fast response to users when LPG leakage occur. At the same time, any

fatal incident will be avoided.

The project’s prototype will be implemented in residential area such as home

and small premises like food stall or food court. Besides that, this prototype can also

provide service to community in form of educational training tool for students in all

over institution to expose them about the important usage of LPG leakage detector

and the security alerts as well to make them understand the danger of gas leakage.

1.5 Conclusion

This chapter describes the project background, goals, problem statement,

purposes and limitation of the dissertation of this project. In addition, it shows details

about problems or aims to be solved and how the project will be conducted. In the

next chapter will provide an overview or related work that relates with this project in

details.

4

CHAPTER 2 LITERATURE REVIEW

2.0 Introduction

This chapter provide a review of LPG leakage detector by using

microcontroller and GSM network also the uses of servo motor drive to. In this

chapter also provide the information about hardware used in this project. The main

sources of information are taken from journals, articles, case report and websites.

Each review sources are selected according to the similarity of projects’ scope.

2.1 PIC16F877A as A Controller

Regarding this project, Figure 2.1 shows the microcontroller that will be used

as the project controller. The function of microcontroller are to set the level of

concentration of the LPG leakage for gas sensor to detect leakage, send signal to

GSM network for notification alert and activate the auto cut off gas system.

Figure 2.1: PIC 16F877A pins

5

Introduction

PIC16F877A established by Microchip is a CMOS-FLASH based elite 8-bit

RISC microcontroller. It consummately fits numerous uses from auto businesses and

controlling home machines to modern instruments, remote sensors, electrical

entryway locks and security gadgets. It is likewise perfect for savvy cards and in

addition for battery supplied gadgets on account of its low utilization. EEPROM

memory makes it less demanding to apply microcontrollers to gadgets where

perpetual capacity of different parameters is required (codes for transmitters, engine

speed, collector frequency, and so on.). Minimal effort, low utilization, simple taking

care of and adaptability make PIC16F877A pertinent even in regions where

microcontrollers had not already been considered for instance; clock capacities,

interface substitution in bigger frameworks, coprocessor applications, and so forth.

In system programmability of this chip (alongside utilizing just two pins as a

part of information exchange) makes conceivable the adaptability of an item,

subsequent to amassing and testing have been finished. This capacity can be utilized

to make mechanical production system generation, to store alignment information

accessible strictly when last testing, or it can be utilized to enhance programs on

completed items. This powerful 200 nanosecond instruction execution yet easy-to-

program which only 35 single word instructions that microcontroller packs

Microchip's powerful PIC® architecture into a 40 pin package. The PIC16F877A

features 256 bytes of EEPROM data memory, self-programming, an ICD, 2

Comparators, 8 channels of 10-bit Analog-to-Digital converter, 2

capture/compare/PWM functions, the synchronous serial port can be configured as

either 3-wire Serial Peripheral Interface (SPI™) or the 2-wire Inter-Integrated Circuit

(I²C™) bus and a Universal Asynchronous Receiver Transmitter

(USART)(www.microchip.com).

6

Previous Research

Microcontroller can be employed to replace a lot of external components

while adding extra functionalities at a cost comparable as a simple integrated

comparator Rawat et al. (2014).

Gas sensor detects the gas leakage and gives the signal to the microcontroller

with the help of ADC. After that in second step the microcontroller receive the

signal, send by gas sensor. It sends activation signal to other external devices

attached with it Shrivastava et al. (2013).

An efficient and smooth working controller is needed to continuously sense

both leakage and level of the gas and also fast response is require when leakage

found .Along with this the monitoring system must provide additional leakage

information which can be used in further processing. The detection system includes

Arduino Duemilanove microcontroller board as shown in Figure 2.2, which is

Arduino compatible with microcontroller chip ATmega328p. The Duemilanove is a

microcontroller breakout board featuring ATmega328 based on the popular Arduino

Footprint T.Soundarya et al. (2014).

Figure 2.2: Arduino Duemilanove with ATmega328p microcontroller

(T.Soundarya et al. 2014)

7

The PIC18F1320 microcontroller has been chosen to perform the desired task

of gas leakage detection and activate the alarms when the exposure limit exceeds the

acceptable values as per UK safety standards. At the point when the sensor detects no

gas noticeable all around, it delivers a voltage beneath 1.2V on the yield pins which

are associated with port RA0 of the microcontroller. At the point when the sensor

detects the vicinity of gas noticeable all around because of a release, the voltage

transcends 1.2V. The voltage differs somewhere around 1.2V and 5V relying upon

the level of gas fixation distinguished Mahalingam et al. (n.d.).

2.2 GSM Modem Network

To fulfil the function of the project, GSM modem network will be used as

notification alert to user. It will be activated when the modem receives signal from

microcontroller and will send out notification to the users during LPG leakage.

Introduction

A GSM Modem stands for Global System for Mobile Communications is a

telecommunication device, a wireless modem that uses GSM wireless network. GSM

Modem comes in various interfaces, such as PCMCIA Type II, USB and Serial. It is

a wireless modem just like dial-up modem works with GSM wireless network. The

difference between dial-up modem and wireless modem is wireless modem sends

and receives data through radio waves whereas dial-up modem send and receive data

through a fixed telephone line.

This project uses SIM900A which is one of the model of GSM network

modem. SIM900A basically is a tri-band GSM or GPRS engine that works on

frequencies EGSM 900 MHz, DCS 1800 MHz and PCS1900MHz. SIM900A

provides GPRS multi-slot class 10 capability and support the GPRS coding schemes

CS-1, CS-2, CS-3 and CS-4. The SIM900A is designed with power saving technique,

the current consumption to as low as 2.5mA in SLEEP mode. SIM900A also

integrated with the TCP/IP protocol，Extended TCP/IP AT commands are

8

developed for customers to use the TCP/IP protocol easily, which is very useful for

those data transfer applications.

Previous Research

According to Rajitha and Swapna, (2012) if these gases exceed the normal

level then an alarm is generated immediately and also an alert message (SMS) is sent

to the authorized person through the GSM. The advantage of using this method

instead of the manual method is that it offers quick response time and accurate

detection of an emergency and in turn leading faster diffusion of the critical situation.

GSM modem is highly flexible plug and play modem based on tri-band

SIMCOM300. SIMCOM300 can fit almost all the space requirements in much real-

time application. This global system for mobile communication technology making it

very easy to send and receive the messages support the AT commands. These

commands can be implemented by interfacing to the receiver and transmitter pins of

microcontroller. MQ6 gas sensor detects the leakage of gas, weight sensor provides

the level in cylinder, and microcontroller will take the protective and necessary

action. All these notable information or status happening has to be conveyed to the

user. The SIMCOM300 shown in Figure 2.3 stores the mobile number of users and

distributors T.Soundarya et al. (2014).

Figure 2.3: SIMCOM300 GSM Modem, T.Soundarya et al. (2014)